SUS304不锈钢点焊接头疲劳寿命研究  

STUDY ON FATIGUE LIFE OF SUS304 STAINLESS STEEL SPOT WELDED JOINTS

作　　者：赵佳伟 陶友瑞 裴佳星 张禹 ZHAO JiaWei;TAO YouRui;PEI JiaXing;ZHANG Yu(School of Mechanical Engineering,Hebei University of Technology,Tianjin 300401,China;Qinhuangdao Tobacco Machinery Co.,Ltd.,Qinhuangdao 066000,China)

机构地区：[1]河北工业大学机械工程学院,天津300401 [2]秦皇岛烟草机械有限责任公司,秦皇岛066000

出　　处：《机械强度》2023年第4期1005-1010,共6页Journal of Mechanical Strength

基　　金：河北省自然科学基金创新群体项目(E2020202142)资助。

摘　　要：为了准确预测工程机械上SUS304不锈钢点焊接头的疲劳寿命,提出了一种用于焊点寿命预测的S-N曲线。根据常见的几种点焊接头的结构形式,制备了不同板厚组合的拉剪疲劳试件,通过疲劳试验获取了试件的疲劳寿命数据。利用CT扫描实验获取了准确的焊核直径,建立了试件的有限元模型,并通过光学应变测量试验验证了该模型的准确性。然后,基于Rupp等效结构应力法和疲劳试验数据建立了综合不同板厚组合和载荷比的结构应力-寿命曲线(S-N曲线),并使用Goodman修正法消除了载荷比的影响。最后,建立了振动输送机有限元模型,并进行瞬态动力学分析获取了振槽焊点的结构应力,基于建立的S-N曲线预测了焊点寿命。结果显示,振槽各焊点接头无疲劳问题,存在焊点冗余情况,可以做轻量化设计。A S-N curve for predicting the life of welding joints is proposed to accurately predict the fatigue life of SUS304 stainless steel spot welded joints on construction machinery.According to several common structural forms of spot welding joints,tension shear fatigue samples with different plate thickness combinations were prepared,and the fatigue life data of the samples were obtained through fatigue test.The accurate nugget diameter is obtained by CT scanning experiment,then the finite element model of the specimen is established,and the accuracy of the model is verified by optical strain measurement experiment.Then,based on Rupp equivalent structural stress method and fatigue test data,S-N curves integrating different plate thickness combinations and load ratios are established,and Goodman correction method is used to eliminate the influence of load ratio.Finally,the finite element model of vibrating conveyor is established,the transient dynamic analysis is carried out to obtain the structural stress of vibrating groove solder joint,whose life is predicted based on the established S-N curve.The results show that there is no fatigue problem in each solder joint of the vibration groove but solder joint redundancy,so it can be designed lightweight.

关 键 词：304 不锈钢 点焊 S-N 曲线 疲劳寿命 振动输送机 

分 类 号：TG405[金属学及工艺—焊接]